| Message ID | 20190507131848.30980-1-lukma@denx.de |
|---|---|
| Headers | show |
| Series | y2038: Linux: Provide __clock_settime function supporting 64 bit time | expand |
This patch set introduces the conversion of __clock_settime to explicit 64 bit struct __timespec64 arguments. As a result this function is now Y2038 safe. To achieve the above goal - new, internal to glibc, struct __timespec64 has been also introduced as well as helper functions to handle time conversions on 32 bit systems. The code from this patch set uses new clock_settime64 syscall (explicit 64 bits) from Linux kernel (5.1+). In glibc new __ASSUME_TIME64_SYSCALLS define has been introduced to indicate if above syscall is provided by the kernel. This work is (loosely) based on a previous development/patches: https://libc-alpha.sourceware.narkive.com/zniMOWui/rfc-patch-00-52-make-glibc-y2038-proof#post68 Github branch (including the y2038 conversion example): https://github.com/lmajewski/y2038_glibc/commits/Y2038-2.29-glibc-__clock-internal-struct-timespec-v3 Those patches have been applied on top of master branch: SHA1: 32e902a94e24fc5a00168d0df3301098704c61fb Shall be used with provided meta-y2038 for development and testing: https://github.com/lmajewski/meta-y2038 I've used guidelines from: https://www.gnu.org/software/libc/manual/html_mono/libc.html "D.2.1 64-bit time symbol handling in the GNU C Library" to convert *clock_settime*. and most notably from: https://sourceware.org/glibc/wiki/Y2038ProofnessDesign#clock_gettime.28.29 Feedback and comments are more than welcome. Lukasz Majewski (5): y2038: Introduce __ASSUME_TIME64_SYSCALLS define y2038: Introduce internal for glibc struct __timespec64 y2038: Provide conversion helpers for struct __timespec64 y2038: linux: Provide __clock_settime64 implementation y2038: Support for Y2038 safe time on 32 bit systems include/features.h | 19 ++++ include/time.h | 121 +++++++++++++++++++++++ manual/creature.texi | 28 ++++++ sysdeps/unix/sysv/linux/clock_settime.c | 53 +++++++++- sysdeps/unix/sysv/linux/kernel-features.h | 38 +++++++ sysdeps/unix/sysv/linux/x86_64/kernel-features.h | 9 ++ time/Versions | 3 + time/bits/types/struct_timespec.h | 15 ++- time/bits/types/time_t.h | 4 + time/time.h | 9 ++ 10 files changed, 294 insertions(+), 5 deletions(-)